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Compare the published Medicare service mix of Frederick Greiner Barr, M.D. with clinicians in the same registry specialty: Specialty details in registry.

CHEVY CHASE, MD · 10 milesEdit location
Within 10 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 64 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Chitra Rajagopal, MD

Hematology/Oncology (CMS) · Bethesda, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
84%Service-mix similarity~4.1 milesView profile →

James Xunhai Xu, M.D.

Hematology · Hematology/Oncology · Internal Medicine · Medical Oncology (CMS) · Rockville, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
75%Service-mix similarity~4.7 milesView profile →

Dong Won Kim

Internal Medicine (CMS) · Silver Spring, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Injection of drug or substance under skin or into muscle (96372)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
73%Service-mix similarity~6.8 milesView profile →

Patricia A Rodriguez, M.D.

Hematology/Oncology (CMS) · Arlington, VA

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
70%Service-mix similarity~7.2 milesView profile →

Isabelle Phuong Le, M.D

Hematology/Oncology (CMS) · Arlington, VA

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
66%Service-mix similarity~7.2 milesView profile →

Ralph V Boccia, M.D.

Hematology/Oncology (CMS) · Bethesda, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
66%Service-mix similarity~4.1 milesView profile →

Courtney D Ackerman, M.D.

Hematology/Oncology (CMS) · Silver Spring, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
64%Service-mix similarity~6.8 milesView profile →

Nelson Gustavo Neder Kalil, M.D.

Hematology/Oncology · Internal Medicine (CMS) · Rockville, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Injection of drug or substance under skin or into muscle (96372)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
63%Service-mix similarity~4.7 milesView profile →

Mounika Gangireddy

Internal Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Injection of drug or substance under skin or into muscle (96372)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
63%Service-mix similarity~4.6 milesView profile →

Robert Joseph Christie, M.D.

Hematology/Oncology (CMS) · Arlington, VA

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
63%Service-mix similarity~7.2 milesView profile →

Harminder Singh Sethi, MD

Hematology/Oncology (CMS) · Hyattsville, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
62%Service-mix similarity~6.3 milesView profile →

George A Sotos, M.D.

Hematology/Oncology (CMS) · Rockville, MD

Shared published services
3 shared services · view billing descriptions
  • Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
61%Service-mix similarity~8.3 milesView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in approximate distance order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.